Public bugzilla bugs take precedence over duplicate internal bugs. However, sometimes it's necessary to mark a public bug as a duplicate of an internal bug. In this case, use this bug as the duplicate and (Khronos members) also follow the instructions given here:
https://cvs.khronos.org/wiki/index.php/COLLADA_policy_for_duplicate_bugs
(This applies to spec and schema for 1.5.0 target bugs.)